[ 16.169694] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.397517] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.597394] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.268207] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 21.431219] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 26.820511] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 26.920654] kasan: CONFIG_KASAN_INLINE enabled [ 26.925080] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.937859] Dumping ftrace buffer: [ 26.941367] (ftrace buffer empty) [ 26.945050] Modules linked in: [ 26.948323] CPU: 1 PID: 3321 Comm: syzkaller011588 Not tainted 4.4.107-g610c835 #4 [ 26.955992] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.965311] task: ffff8800b4c8df00 task.stack: ffff8800b4728000 [ 26.971331] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.979556] RSP: 0018:ffff8800b472f970 EFLAGS: 00010a07 [ 26.984969] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 26.992210] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.999445] RBP: ffff8800b472f980 R08: 0000000000000001 R09: 0000000000000000 [ 27.006684] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.013923] R13: 0000000000000020 R14: ffff8801d08f0000 R15: dffffc0000000000 [ 27.021160] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009c99840 [ 27.029353] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.035206] CR2: 0000000020ef0fe0 CR3: 00000000b44a1000 CR4: 00000000001406e0 [ 27.042445] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.049681] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.056916] Stack: [ 27.059028] 0000000000000000 ffff8801d08f0158 ffff8800b472f9e0 ffffffff825b8cf1 [ 27.066986] ffff8801d08f0170 ffffed003a11e02b ffffed003a11e02e ffff8801d08f0168 [ 27.074933] dead4ead00000000 ffff8801d08f0140 0000000000000000 0000000000000000 [ 27.082879] Call Trace: [ 27.085442] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.091910] [] sg_finish_rem_req+0x2b5/0x340 [ 27.097934] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.104051] [] ? sg_get_rq_mark+0x142/0x190 [ 27.109997] [] sg_read+0x8c2/0x1490 [ 27.115250] [] ? do_page_fault+0x27/0x30 [ 27.120939] [] ? page_fault+0x28/0x30 [ 27.126358] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.132987] [] ? fsnotify+0xee0/0xee0 [ 27.138403] [] ? avc_policy_seqno+0x9/0x20 [ 27.144258] [] do_loop_readv_writev+0x141/0x1e0 [ 27.150541] [] ? security_file_permission+0x89/0x1e0 [ 27.157258] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.163888] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.170522] [] compat_do_readv_writev+0x5df/0x6e0 [ 27.176986] [] ? vfs_writev+0xb0/0xb0 [ 27.182414] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.188368] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.194484] [] compat_readv+0xd9/0x140 [ 27.200013] [] compat_SyS_readv+0xd8/0x1b0 [ 27.205892] [] ? SyS_pwritev+0x230/0x230 [ 27.211588] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.217798] [] ? SyS_pwritev+0x230/0x230 [ 27.223493] [] do_fast_syscall_32+0x314/0x890 [ 27.229623] [] sysenter_flags_fixed+0xd/0x17 [ 27.235655] Code: 76 ae 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 27.262068] RIP [] __free_pages+0x21/0x90 [ 27.267955] RSP [ 27.271814] ---[ end trace 9cffe1d3f3bc4852 ]--- [ 27.277758] Kernel panic - not syncing: Fatal exception [ 27.283500] Dumping ftrace buffer: [ 27.287008] (ftrace buffer empty) [ 27.290685] Kernel Offset: disabled [ 27.294281] Rebooting in 86400 seconds..